package cn.tedu.sp06.filter;

import cn.tedu.web.util.JsonResult;
import com.netflix.zuul.ZuulFilter;
import com.netflix.zuul.context.RequestContext;
import com.netflix.zuul.exception.ZuulException;
import org.apache.commons.lang.StringUtils;
import org.springframework.cloud.netflix.zuul.filters.support.FilterConstants;
import org.springframework.stereotype.Component;

import javax.servlet.http.HttpServletRequest;

@Component
public class AccessFiles extends ZuulFilter {
    //pre
    @Override
    public String filterType() {
        return FilterConstants.PRE_TYPE;
    }

    //过滤器的顺序号
    @Override
    public int filterOrder() {
        //有五个默认的过滤器，自己的过滤器加到末尾
        return 6;
    }

    /**
     * 针对当前请求，判断是否要执行过滤代码
     * 如果调用（item-service）后台商品服务，检查是否登录
     * 否则，不检查登录，直接访问
     *
     * @return
     */
    @Override
    public boolean shouldFilter() {
        //先获取当前请求的上下文对象
        RequestContext ctx = RequestContext.getCurrentContext();
        //当前请求调用的服务id
        String serviceId = (String) ctx.get(FilterConstants.SERVICE_ID_KEY);//"serviceId"
        //调用的是否是item-service
        return "item-service".equals(serviceId);
    }

    /**
     * @return
     * @throws ZuulException
     */
    @Override
    public Object run() throws ZuulException {
        //获得上下文对象
        RequestContext ctx = RequestContext.getCurrentContext();
        //获得request对象
        HttpServletRequest request = ctx.getRequest();
        //http://localhost:3001/item-service/6u5y4t3r?token
        //接收token参数
        String token = request.getParameter("token");
        //如果没有token，阻止继续调用，直接返回响应
        if (StringUtils.isBlank(token)) {
            //阻止继续调用
            ctx.setSendZuulResponse(false);
            //直接返回响应
            ctx.addZuulResponseHeader("Content-Type","application/json;charset=UTF-8");
            ctx.setResponseBody(JsonResult.err().code(400).msg("Not login!").toString());
        }
        return null;//这个返回值没有使用
    }
}
